Grinder attachment for drills



F. R. LUECK.

GRINDER ATTACHMENT FOR DRILLS.-

APPLICATION FILE-D AUG.2. 1-920.

Patented Aug. 22, 1922.

F. R. LUECK.

GRINDER ATTACHMENT FOR DRILLS.

APPLICATION FILED AUGQZ, I920.

Patented Aug; 22, 1922.

FRANK a. Lenoir, or MILWAUKEE, Wisconsin.v f

GRINDER ATTACHMENT FOR DRILLS. i

Specification of Letters Patent.

[Patented ring. as; i922.

Application vfiled August 2, 1920."-Seria1'No. 400;694

To all whom it may concern:

Be it known that I, FRANK R. LUECK, a

citizen of the United States, residing at ing and sharpening drills of different sizes to predetermined cutting and clearance angles; to provide for easy and quick removal or the 1 drill holder from the grinder for convenient inspection of the work and for its adjustment in the holder without disturbing the adjustments of the work and parts of the at tachinent relative to one another and to the grinding wheel; to facilitate clamping drills of diflerent sizes in proper grinding position in the drill holder; and generally to improve the construction and operation of devices of this class. I

It consists in the construction, arrange ment and combination of parts as hereinafter particularly described and pointed out in the claims. v

In the accompanying drawing like characters designate the same parts in the several figures. v

Figure 1 is a plan view of agrinder attachment for drills embodying the invention as applied to a grinder of typical con struction, parts of which are shown; Fig.2 is a vertical section on the line 2-2, Fig. 1, showing the adjustable connection between the drill holder and its support for advancing the holder towards the working faceoi the grinding wheel and grinding both lips of the drill alike; Fig. 3 is a side elevation of a portion of the attachment as viewed from the right relative to Fig. l, the annular bracket or support being shown in cross section; Fig. l is an end elevation of the drill llOldGf'IQIIlOVGCl-fI'OIII the rest of the attachment and as viewed towards the point of a drill held therein; Fig. 5 is an inverted perspective view of the end of the drill holder nearest the grinding wheel; and Fig. 6 is a section on tlieline 6-6, Fig. 1, of the swivel joint connection between the drill holder and its 'support.

The attachment consists of an oscillatory drill holder comprising an angle or \l-shaped bar 1 which is connected atcan obliqueangle thereto bya swivel joint with a channeled head 2, mounted on an angular, bracket or support 3. The bracket .or support 3 lSfld-x j istably mounted on an arm- 4, which is r il'astened by-a screw 5 tothe case or frame 6 parallel with the axis of the grinding wheel 8, andtlie arm 4: is angularly adjustable on the screw for raising or loweringthe drill iiig wheel. The bracket or support 3 is formed atone end witha collar or sleeve 10, which is slidably fitted on :and adjustable.

lengthwise oi'ithe arm 4., vFrom the collar 10 the bracket extends transversely to the arm 4' in front and below the center of'the grinding wheel 8 Land thenceupwardly, terminating at the end'opposite thei'collar with a cylindricalsocket or guideway 11, parallel of a grinden The screw '5 -is arranged V holder and its supportrelative, tothe grindwith the collar 10fand at right angles or transverse to the axis of thegrinding wheel.

The bracket Sis fastenedin adjusted-position on the arni' l by a thumb screw l2. 7

The head 2 is providedat an oblique angle which is fitted and adjustable lengthwise in thereto with ahollow cylindrical-shank 1'45,

the socket/11 being held' againstturning therein by a'spline 15 asshown in Fig. 2'.

A rod 17 fastened atone end in the head 2 and extending axially through the shank 14L and a holeinithe opposite. end [of "the socket 11, is threaded and provided at the end protruding from the socket withg'a graduated adjusting- 11M718. A spring 20 lIL- sorted in the'hollow shank rla and bearing at one end against the head2 and at the opposite end against the closed end'ofthe socket 11, tends to shift the head with the drill holder carried thereby, away from the in engagement with "the. socket l1. An

grinding wheel, and holds the hub of the nut index or pointerQl, attached to the socket 11 and projecting over the graduated periphery of the nut 18, indicates the position I oi the drill holderrelative to the working face of the grinding wheel, and enables the operator to determine with a'couracy'the extent to which a drill is advanced'by the nut towards the grinding wheel, so that both lips of the drillmay be ground exactly alike.

The swivel joint connection between the drill vholdernand its support loy -which the proper movement of the holder isde'tered or grind ng dri s with cut i gdges I i at the proper angle andywith propercleari l ance, comprises a swivel block 23, fitted in he channel oi. the head 2 and pivoted therein. adjacent its outer end on a pin. 24-, and a swivel pin 25 rotatably and removably fitted in the block 23 and adjustably at tached to the drill holden The head 2 is provided with a pin or key 27, projecting into the channel opposite the open side thereof, and the swivel pin 25 is formed with a circumferential groove 28 arranged to engage with the pin or key when the parts of the attachment are assembled in working position, the swivel. block being cut away or recessed to receive the pin or key and permit engagement therewith of the groove in the swivel pin, as shown in Fig. 1.

The swivel block 23 is automatically locked and releasably held in place in working position in the channel of the head 2 by a spring pin or latch 30, shown in Fig. 6, the block being beveled on the backside to lift the pin and permit it to drop into engagement with a socket in the block when the block is swung on its pivot pin 2% into place in the channel of the'head 2.

The swivel pin 25 is provided at its inner end with a head 32 having a tongue and groove sliding and guiding connection with a head 33, attachedto the inner end of the drill holder 11 The head 33 of the drill holderis fastened in adjnsted'position to the head 32 of the swivel pin by a thumb screw 34: passing; through a longitudinal slot in the head 32 and threaded in the head 33. i

The tongue and groove sliding connection between the heads 32 and and the slot the head 32 are substantially parallel with the plane of rotation of the grinding; wheel 8 and also with the shank 14 of the head 2 and the arm 4. i

As shown in Fig. 5, the head 33 is pro vided 'onone edge with a scale 36, and the head 32 has an index edge 37 overhanging the scale to adjust the holder for grinding drills of diflerent sizes.

The swivel block 23 and the head 32 are formed with stop lun s and 40, for limiting the upward movement of the outer end of the drill holder and determining the proper initial position of the holder for grindingthe lips of drills. For properly positioning and securing drills of different sizes in the t -shaped bar of the holder.'the holder provided with an adjustable clamp and with an adjustable stop.

'lhe clamp consists of an elongated jaw 42. which is pivotally connected with a yoke or loop 43 slidably mounted and adjustable lengthwise of an a "in Msextending from the head 33 transversely over the angle bar l. A thumb screw 45 threaded in an extension or outwardly projecting arm 46 of the jaw and arranged to engage with the under side of the arm 44h, simultaneously cla nps the yoke or loop L3 in place on the arm n and forces the jaw 42 into engagement with the side of a drill in the angle bar 1, securely holding it in place therein.

Separation of the yoke 4-3 to which the jaw 42 is pivoted, from the arm 44, is prevented by a stop pin 47 inserted in and projec' ing from the arm adjacent its outer end.

The adjustable stop for preventing endwise displacement of drills in the angle bar 1, consists oi. a block 49 formed with an angular opening corresponding with the bar 1, on which. it is slidably mounted and secured in adjusted position by a thumb screw 50. The block 49 is provided with an outwardly extending arm 51 fitting into the angle of the bar 1 and supporting the block in a plane perpendicular to the wings of the angle bar.

A gage plate 53., attached to the inner end of the head 33 and overhanging the upper wing of the angle bar 1, by engagement with the leading spiral edges of a drill, determines the proper position of the lips of the drill for grinding.

The extended axis of the swivel pin 25 in its normal working position, as shown in F l, crosses the longitudinal center of the angle bar 1., and the axis of a drill held therein a short distance above and at an. oblique angle thereto and provides for the required clearance in grinding the lips of drills of different sizes.

In the operation of the attachment for grinding a drill of any given size. the head 33 of the angle bar 1 is adjusted for that size with relation to the head 32 by means of the scale 36 and index edge 37, and fastened relative to the head 32 and swivel pin 23 by the screw The drill being placed in position in the angle bar 1 with one of its leading spiral edges in engagement with the overhanging gage plate 53, and its angular cutting edge projecting a suflicient distance in advance of said plate for grinding, the yoke or loop 43 is adjusted on the arm l-lto proper posi* tion, the jaw l2 is forced by the screw 45 against the side of the drill, thereby clamping it firmly in place against the wings of the angle bar 1, and the stop block 49 is adjusted to bear against the outer end of the drill shank and secured in place by the screw 50. The nut 18 being turned clockwise on the threaded rod 17 to a position which will permit of a suilicient advance movement of the drill holder relative to the bracket or support 3, for grinding the drill, and the arm 4 and bracket or support 3 being adjusted so that the lip or edge of the drill to be ground will be presented to the periphery of thegrind ing wheel 8 horizontally opposite its center when the drill holder is in its initial working; position, as shown by full lines in Figs. l and 3. the holder is advanced by turning the wheel, and the wheel being rotated, the

holder with the drill is rocked by the operator, as indicated inFig. 3, downward and upward'from and to its initial'position, def" I termined by the stop lugs 39 and 40, the

nut 18 being turned further counterclockwise if necessary to advance the drill towards the wheel, and the foregoing operations repeated till a, sharp and true cutting edge is obtained. i

The adjustment of the :nut 18 at the limit of the advance movement of the drill holder, as indicated by the index 21, being noted, the pin 30 is withdrawn from ongagement with the swivel block 23 and the the pivot pin 24 drill holder is swung on away by doqted lines in Fig. 1. The clamp 42 18 then released and the drill is turned. into a clamping position for grinding the-other lip. The nut 18 being turned counterclockwise to allow for the required advance movement of the holder, the holder is swung back into and automatically locked by the spring pin 30 in operative positiona The holder with the, drill'is then advancedtowards the grind'ng wheel by-the nut 18 and rocked on its swivel connection with the head .Ztill the second lip is ground at exactly the same angle and with the same clearance as the first lip, the nut 18 being turned counterclockwise in advancing the drill to exactly the same point, .as determined by the index 21, as before, for grinding the first lip.

lVhen the drill holder is swung with the swivel block 23, away from the grinding wheel, as indicated by dotted lines in Fig. 1, it'is released and can be withdrawn from the swivel block-for more conveniently resetting, replacing or inspecting a drill,

The removal otthe drill holder and the angle bar 1 from the swivel block 23 does not change or afi' ect any of the adjustments of the attachment. For grinding drills of larger diameters or sizes, the head 33 with the angle bar 1, is set forward toward the grinding wheel -8 with relation to the swivel pin head32 according to thescale 36, so that the lips of the to a longer radius, the extended axis of the swivel pin 25 crossing the axis ofthe drill further from the grinding face of'the wheel.

Various changes in the details of construction and arrangement of parts may be made without departure from the principle and scope of the invention as defined in the following claims.

I claim:

1. In a grinder attachment for drills the combination of a support connected with the grinder frame, avdrill holder, a swivel joint normally connecting the drill holder from the grinding wheel, as indicated larger drills will be ground,

with said support at an oblique angle to face of the said holder and to the working grinding wheel and comprising members separably fitted to each other, one of" the swivel members being pivotally connected to permit the drill holder to be swung into and out of operative position relative to the grinding wheel, means for locking thepivoted-swivelvmember to said support. in operative position, andmeans adapted to au-' tomatically lock the swivel members together in normal working relation to each other when the pivoted swivel member is swung into operative position and to unlock said members and permit the removal ofthe drill holder whenssaid pivoted swivel member is swungout of operative position.

transversely-to its axis with said support 2. In a grinder attachment for I drills the combination of a I support connected with the grlnding frame, a drill holder l having an oscillatory :separable connection with said support on an axis disposed at'an oblique angle to the holder and normally at an oblique angle to the axis of -the grinding wheel a and having a .;pivot; connection v-with the-support on an axis which is transverse to the axis of oscillation and onwhich the holder'is adapted. to beswung towards and from the grindingwheel intorand out of operative position, means for. automatically locking and releasing said oscillatory connection, when theholder is swung into and out of "operative position, and means ior locking he hold r nope ati e p si ona r a ti .hmen o d ills th combination of a support CQI I 9ted with the'grinder frame a drill holder, a swivel block, a swivel pin .fitted -;to turn in said block, one ofthe-swivel members being pivotally connected transversely to its axis with said support andadapted'to be swung into and out of normal, position'atan oblique angle to the working face of a the grinding wheel and the drill, holder being attached to the other .--swivel member at an oblique angle theretoand to the plane of the-grind ing wheel, means for fastening the pivoted swivel member ininormal position to said support, andmeans for automatically. fastening. the swivel memberstogether when they are swung intonormal position and'fo'r releasing-them vto permit'the removal of the drill holder when, they areswung out of normal position.

4. In a'grinder attaohment for drills the combination of a head connected with the grinder frame at an oblique angle to the working face of the grinding wheel and provided with a key, a drill holder, a swivel block, a swivel pin fitted in said block,one of the swivel members being pivotally connected transversely to its axis with said head and the other swivel member being attached to the drill-holder at an oblique angle thereto and normally to the working face of the grinding wheel and provided with a circumiterential groove for engagement with said key when the parts are in operative position, and a spring latch torreleasably locking one swivel member to said head in working position.

5. In a grinder attachment for drills the combination of a support connected with the grinder frame and having a guide-way parallel with the plane of the grinding wheel, a head having a shank fitted and longitudinally adjustable in said guide-way, a spring tending to shift said head away from the grinding wheel, a screw and graduated nut adjustably connecting the head with said support for determinately shifting said head towards the grinding wheel, and a drill holder connected with said head obliquely to the plane of the grinding wheel by a swivel joint at an oblique angle to the holder and to the working face of the grinding wheel.

6. In a grinder attachment for drills the combination of a support adapted for attachment to the grinder frame, a head havin an adjustable graduated screw connection with said support and movable parallel With the plane of the grinding wheel towards and from its axis, a drill holder connected with said head by a swivel joint comprising two separable members normally disposed obliquely to the peripheral working face of the grinding wheel and'to the holder and movable into abnormal position to permit the removal of the holder, the holder being connected with one swivel member bya graduated sliding joint and adjustable parallel with the plane of the grinding wheel towards and from its working face, and means for releasably fastening the swivel members together in normal working position.

7. In a rinder attachment for drills the combination or" a support, a channeled head provided in its channel with a key and having a shank disposed obliquely to the channel and adjustable longitudinally in said support, a swivel block fitted and pivoted transversely to its axis in the channeled head and recessed to receive said key, a swivel pin fitted in the swivel block and circumferentially grooved to engage with said key to confine the pin in the swivel block when it is turned on its pivot into working position in the channeled head,

a drill holder attached to the swivel pin .at an oblique angle thereto, and means for reasonably locking the swivel block in its normal position in the channeled head.

8, In a grinder attachment for drills the combination of a support provided with a channeled headv disposed obliquely to the working face of the grinding wheel and provided in its channel witha key, a swivel block fitted-and pivoted transversely to its axis in the channeled head and transversely recessed to receive the key, a swivel pin removably fitted in the swivel block and formed with a groove to engage with the key in the channeled head when the swivel block is in Working position, means for releasably locking the swivel block in working position in the channeled head, and a drill holder having a graduated adjustable slide connection with the swivel pin at an oblique angle thereto- 9. In a grinder attachment for drills the combination of a support, a channeled head provided in its channel with a key and. hav ing a shank disposed obliquely to the channel. and adjustable longitudinally in said support, a swivel block pivoted transversely to its axis in the channeled head into and out of working position in which it is adapted to be turned on its pivot, a drill holder having an adjustable slide connection with the swivel pin at an oblique angle thereto, and means for automatically and releasably locking the swivel block in working position'in the channeled head.

10. In a grinder attachment for drills the combination of a support connected with the grinder frame, a drill holder of V-shaped cross section connected obliquely to the plane of the grinding wheel with said support by a swivel joint having its axis at an oblique angle to the length of the holder and to the plane of the grinding wheel, and an adjustable clamp comprising an arm attached to and extending transversely from the holder, a loop slidably mounted on the arm, a jaw pivotally connected with the loop, and a screw threaded in an extension of the jaw and adapted by engagement with the arm'to force the jaw into engagement With a drill in the holder between its wings.

In witness whereof I signature.

hereto affix FRANK n. LUEOK. 

